| High-flow nasal prong O2 (n=113) | Venturi mask O2 (n=108) | |
| Age | 60.9 (SD=18.3) | 59.8 (SD=18.7) |
| Sex (M:F) | 89:24 | 81:27 |
| Injury Severity Score | 12.2 (SD=5.9) | 12.0 (6.6) |
| Chest Abbreviated Injury Score | 3 (2.5) | 3 (2.5) |
| Rib fractures, n | 4 (3.6) | 4 (3.5) |
| Flail segment present (%) | 19 (16.8) | 16 (14.8) |
| Bilateral rib fractures (%) | 15 (13.3) | 15 (13.9) |
| Smoker or COPD (%) | 38 (33.6) | 37 (34.3) |
| Rib fixation (%) | 4 (3.5) | 5 (4.7) |